基于RFID技术的方向感知方法研究

A novel orientation sensing method based on RFID technology

目标物方向感知是供应链及设备管理等射频识别(Radio Frequency Identification,RFID)应用领域中亟需解决的问题,基于RFID工作原理及天线散射理论,给出了超高频(Ultra High Frequency,UHF)RFID系统链路模型,利用天线极化分集理论,提出了一种基于RFID技术的目标物方向感知方法.该方法是给目标物贴附两个标签,通过改变阅读器天线极化方向获取分集接收信号强度,并对所得数据进行统计分析,根据分析结果估计目标物方向.在室内开阔环境下对该方法进行了测试,测试结果表明,该方法对目标物方向平均估计误差为10.1°.

It is critical to sense orientation of target objects for radio frequency identification （RFID） applications, such as supply chain, equipment management, and so on. Based on the principles of ultra high frequency radio frequency identification （UHF RFID） and the theory of antenna scattering, a link budgets model of RFID is provided. Utilizing the technology of RFID and polarization diversity, a novel method for sensing the orientation is presented. The method requires standard RFID equipment and assumes that each object is attached by two RFID tags. Based on the received signal strength of the tag reply, orientation of the target object is obtained by using of a simple statistical estimator. The performance of the method proposed is evaluated via experimental measurements, and the results show that the mean estimated error of orientation sensing is 10.1°.